Telephone switchboard



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INVENTQR JOHN H LEVISJR. BY @(2 ATTORNEY J.. H. LEVIS, JR

TELEPHONE SWITGHBOARD Filed March 4, 1922 l`llll o o o o o o o u o o o o o o o o o o o o o u o o o o o o\ l5 o o o o o c o o o o o o o o o o o o o o oo vo I o o o o o o o o o o o o nooo o o o` o o o o o o o o a o 00003000GOQQQOOOODOGOOOOQOO May 12, 1925.l

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Patented May 12, 1925.

UNITED STATES 1,537,311 PATENT OFFICE.

JOHN H. LEVIS, JR., OF ROCHESTER, NEWr YORK, ASSIGNOR TO THE STROMBERG- CARLSON TELEPHONE MANUFACTURING COMPANY, F ROCHESTER, NEW YORK,

A CORPORATION OF NEW YORK.

TELEPHONE SWITCHBOARD.

Application filed March 4, 1922. Serial No. 541,175.

To all whom it may cof/worn.'

VBe it known that I, JOHN H. Lnvrs, Jr., a citizen of the United States, residing at Rochester,A in the county of Monroe and State of New York, have invented certain new and useful Improvements in Telephone Switchboards, of which the following is a full, clear, concise, and exact description.

This invention relates to telephone switchboards and more particularly to key and plug shelves for such switchboards.

It is customary on telephone switchboards to provide supports known` as plug shelves for the answering and calling plugs of the cord circuits for use on such switchboards and a keyshelf provided with supervisory signals or lamps which indicate to the operator the progress of a telephone connec-- tion Land is also provided with signaling keys by which any one of several frequencies of signaling current may be applied to a called line.

The present invention has for its purpose an arrangement of the answering and the calling plugs on an operators position in such a location that they can be readily grasped by the operator in the course of establishing a telephone connection.

Another feature of this invention, resides in positioning the supervisory signals associated with the pair of plugs of the cord circuit, so that they may be readily visible to a connecting operator.

l'y reference to the drawings and the following description a more complete understanding of the invention may be obtained. In the drawings Fig. 1 shows a plug shelf and a lieyshelf of one switchboard section and a portion of two other sections, in order that the relation of the various parts may be understood. Fig. 2 is a plan view of Fig. 1 andFig. 2 shows an end view of the plug and lieyshelf.

Fig. 3 is a modified form of the invention in which the answering and calling plugs of a cord circuit as well as the answering and calling supervisory lamps associated with this cord circuit are both arranged in staggered relation.

Fig. 3a is a sectional view through the structure of Fig. 3.

Fig. 4 shows another modified form of the invention wherein the answering and calling plugs are arranged in V forn'iation and the answering supervisory lamps associated with these plugs appear in a straight line. This is shown in the plan view of the keyshelf on the right of Fig. et and in the end view shown in Fig. a, i

Referring first to Fig. 1 and Fig. 2, 5 designates the panels of the switchboard section in which are located strips of terminal jacks. Extending substantially at right angles toy these panels is the plug shelf; this shelf includes a substantially horizontal portion 6, which serves as a support for the answering plugs 7, and an inclined portion 8 connected thereto as shown in the end view of Fig. 2, which serves as a support for the calling plugs 9. A lieyshelf also includes a substantially horizontal portion 10 in which there are mounted party line ringing keys generally designated 11 and aninclined portion 12 in which there are located supervisory lamps 13. The portions 10 and 12 just mentioned are connected to the plug shelf by means ofa hinge 14E, which permits easy access to the apparatus located below the leyshelf.

By placing the calling plugs below the answering plugs, the operator can easily reach the answering plugs 7 without touching the tip of the calling plugs 9, thus insur-r ing that the operator will not receive an electric shock. It will also be noted that the portion 12 of the leyshelf is inclined so that the supervisory lamps 13 are in the line of vision of the operator.

In the modified form of the invention shown in Fig. 3 the answering and calling plugs 15 and 16 are arranged in staggered relation on the raised plug shelf 17. This arrangement of the plugs permits of a reduced length of switchboard section without crowding the calling and answering plugs into such a narrow space that they cannot be easily seized by the operator. ln this form of the invention the keyshelf is provided with a horizontal portion 18 on which there are mounted the ringing keys 19, and an inclined portion 20, serving yas a support for the answering and calling supervisory lamps which are staggered in the same relation as the calling and answering plugs of the various cord circuits. In this arrangement also the portions 18 and 2O forming the lzeyshelf are secured to the plug shelf 17 by a hinge 21.

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In the inodilied forni of the invention shown in Fig. Ll, the plug and keyshelves differ frein those shown in Fig. 8 in the greater width of theA plug shelf.

The plug shelf comprises a substantially horizontal portion 25 for the answering and calling plugs Q6 of the cord circuits'which as will be noted are arranged in V forniation, in order to pei-init a reduced length of plug shelf and still provide sufficient space for the operator to seize the various plugs 26. The key shelf which is hingedly connected to the plugl shelf includes a horizontal portion 27 provided with the ringing keys 28 and an inclined port-ion 29 in which `the supervisory lainps 3() are. mounted. These lan'ips are arranged in a straight line but in such relation that they are easily associated with their related cord circuits.

It. will thus be seen that an improved key and plug shelf for a switchboard is provider in which the connecting plugs occupy a ininin'nun of space and still are readily seized by the operator, also the supervisory signals are placed in the line of vision of the operator thereby renioving unnecessary eye strain on the part of the opera-tor.

That is claimed is l. In a switchboard, a plug shelf, plugs thereon, a keyshelf having a substantially horizontal portion and an inclined portion, keys on said horizontal portion, supervisory signals on said inclined portion, and a hinge connection between the inclined portion of said keyshelf and said plug shelf.

2. In a. switchboard, a plug shelf having two portions in different levels, plugs positioned on each level of said plug shelf, a keyshelf having a horizontal portion and an inclined portion, keys on said horizontal portion, supervisory signals in said inclined portion, and a hinge connection between the inclined portion of said key shelf and said plug shelf.

3. In a switchboard section, a plug shelf having two portions lying in different planes, plugs inounted on each of said portions of said plug shelf, a keyshelf having a. horizontal and an inclined portion, keys on said horizontal portion, supervisory signals in said inclined portion, and a hinge connection between the inclined portion of said keyshelf and said plug shelf.

4f. In a. switchboard sect-ion, a plug shelf having two portions lying in different planes, plugs supported on each of said portions of said plug shelf, and a keyshelf hingedly connected to said plug shelf, said keyshelf including a key support and a signal support lying in different planes.

5. In a switchboard section, a plug shelf, plugs mounted thereon, a keyshelf hingedly connected to said plug shelf, said key shelf including a substantially horizontal portion and an inclined portion lying in a plane intersecting said plug shelf and the horizontal portion of the keyshelf, keys mounted on said keyshelf, and signals on said inclined portion of the keyshelf positioned in associated relation to said plugs.

6. In a switchboard, a plug shelf, plugs positioned on said plug shelf, a key shelf having keys thereon, said plug shelf ant said keyshelf being in different levels, an inclined portion connecting said plug and key shelves, and supervisory signals mounted on said inclined portion.

7. In a switchboard section, a plug shelf having two portions lying in dilferent planes, plugs supported on each of said portions of said plug shelf, a second shelf, an inclined portion connecting said second shelf and said plug shelf, and signals mounted on said inclined portion.

8. In a switchboard, a plug shelf, plugs positioned on said plug shelf, a keyshelf connected to said plug shelf, said keyshelf including a fiat portion and an inclined portion, said inclined portion lying in a plane intersecting said plug shelf and the Aflat portion of said keyshelf, keys inounted on said key shelf, and signals on said inclined portion of the keyshelf positioned in associated relation to said plug shelf.

9. In a suf'itchboard, a ,plug shelf, plugs positioned on said plug shelf, a. key shelf having keys thereon, said plug shelf and said key shelf being in different levels, and an inclined lanip shelf connecting said plug and key shelves, the connection between two of said shelves being a hinge connection.

In witness whereof, I hereunto subscribe iny naine this 28 day of February A. I). 1922.

JOHN H. Lavis, JR. 

